Wang, X.; Wang, L.; Shan, T.; Leng, S.; Zhong, H.; Bao, Q.; Lu, Z.; Deng, L.; Chen, C. Low-Temperature Aging Provides 22% Efficient Bromine-Free and Passivation Layer-Free Planar Perovskite Solar Cells. Nano-Micro Lett 2020, 12, 84.